The bulk properties of dioxane solutions in ethylene glycol at 25–75°C

The densities of ethylene glycol solutions of dioxane were measured at 0–20 mol % dioxane at five temperatures ranging from 25 to 75°C. The apparent molar volumes of dioxane in the solutions were studied. The results were compared with similar characteristics of the aqueous solutions of dioxane and ethylene glycol solutions of tetrahydrofuran. In contrast to these systems, the ethylene glycol-dioxane system did not show a minimum of the apparent molar volumes of dissolved nonelectrolytes. The conclusion was drawn that the solvophobic effects were absent in the bulk properties of the ethylene glycol solutions of dioxane because of the low lability of the spatial net of H-bonds of ethylene glycol and peculiarities of the molecular structure of dioxane.